About Protocatechuic acid
About 3,4-Dihydroxybenzoic acid
About Catechol-p-carboxylic acid
About Pyrocatechol-p-carboxylic acid
About 4-Carboxypyrocatechol
About 3,4-Dihydroxybenzenecarboxylic acid
About metabolite
About hydroxy acid
About polyphenol
About aromatic carboxylic acid